Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.0715y&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #07.15; Bulletin of the American Astronomical Society, Vol. 34, p.652
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We have developed a physically motivated prescription for extra mixing in stars from convective overshooting. The formulation is based upon a strictly hydrodynamic treatment of the boundary zone of the convective region informed by three dimensional hydrodynamic simulations. Gravity waves excited by motion of convective fluid elements are dissipated turbulently, resulting in mixing. More vigorous convection in massive stars results in more mixing, naturally producing a scaling in the degree of overshooting with mass as implied by earlier work. Implementation of the algorithm in the stellar evolution code TYCHO produces carbon stars on the asymptotic giant branch as well as evolutionary tracks for the Pleiades consistent with the lithium depletion age of the cluster determined from brown dwarfs. This work was supported by DOE, grant number DE-FG03-98DP00214/A001
Arnett David
Young Patrick A.
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